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ACCEPT AND PROCEED

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FAQ

Q=60VA

Q (Air flow)=m3/min

V (Air velocity)=m/sec

A (Cross-sectional area)=m2

1mbar=10.197mmAq

1mmHg=13.6mmAq

1psi=703mmAq

1Torr=133.3pa

1Torr=13.3 mmAq

1Torr=1.333mbar

short "STP", in a condition of 20 degrees Celsius, 760mmHg absolute pressure, and 65% Relative

Humidity. The weight for 1m3 of air is 1.2kg in this condition.

(2) Absolute pressure of air: the sum of atmospheric pressure plus Gauge pressure. Usually expressed in units with kgf/m2 or mmaq.

(3) Normal temperature and pressure: for short "NTP", in a condition of 0 degrees Celsius, 760mmHg absolute pressure, and 0% Relative Humidity. The weight for 1m3 of air is 1.293kg in this condition.

(2) Velocity pressure(Pv): (a.k.a. Dynamic Pressure) The pressure of a fluid in motion. Usually expressed in units with kgf/m2 or mmaq.

(3) total pressure: The sum of Static pressure plus Velocity pressure. Usually expressed in units with kgf/m2 or mmaq. The total pressure is a fixed value for blower and fan, it is not changed when reducing the diameter of pipe.

P= P'(273+t/293) (mmAq)

Same reason, when variances in density of air:

P=P'(1.2/γ) (mmAq)

The P', t, andγare measured pressure, temperature, and density of air.

Pv=γ×(V2 / 2g)

Pv: Velocity pressure(mmAq)

γ: proportion of air(kg/m3)

g: Acceleration of gravity(m/s2)=9.8

V: velocity(m/s)